Preparation of thread



April 1935- E. K. GLADDING ETAL I I 1,996,864

PREPARATION OF THREAD Filed May 5, 1952 2 Sheets-Sheet l PERIPHERY OF bObblN I INVENTORS "175252; Jjjcccfcling BY 7% MW Apfil 9, 1935. E. K. GLADDING- EIAL I PREPARATION OF THREAD Filed May 3; 1932 2 Sheets-Sheet 2 \llllllll llllllllllllllllllllllllll IIIllllllllllll llillllllllllllllllIIIIIIIIIIIIII Fig.5 l

' I/YVE/YTOKS EI/ruAf (7C Z kaA/Ld (3' Zara/11A A. RNE) Patented Apr. 9, 1935 ,PREPARATION OF THREAD Ernest K. Gladding and David Franklin Evans,

Buffalo, N. Y.,

Company, New York,

Delaware assignors to Du Pont Rayon N. Y., a corporation of Application May 3, 1932, Serial No. 608,904

8 Claims.

This invention relates to a method of windin thread. The invention also relates to the manufacture of artificial thread. The invention also relates to a method for winding thread into a package which is uniformly permeable to treatreadily permeable by liquids.

ing fluids. The invention will be described in its application to the manufacture of rayon by the viscose process but it will be understood that it is applicable to any process of winding thread.

The prior art discloses two methods of treating rayon: in packages and in skeins. In the past the purification of yarn in skeins has been more rapid, more complete, and more uniform than the purification of yarn in packages but the cost of handling-and the degradation of the yarn by the skein process has caused package treatments to be favorably regarded. On the other hand, trouble has been encountered in package processes by the difficulty of properly winding packages of yarn so that the penetration of purifying liquids will be uniformly effective. This difficulty is increased where winding and.twisting are carried out simultaneously because the twisting imparts additional tension and tends to build up a hard cake which can be penetrated by liquids only with difficulty and in which uniform purification is diflicult to achieve even with the use of excessive quantities of purifying liquids and by treatment for extremely long periods of time.

An object of this invention is to wind thread. Another object of the invention is to twist and wind artificial thread in a single step with the production of a relatively soft package which is Another object of the invention is to lay thread on a yarn package in a, sinuous course. Other objects of the invention will be in part apparent and in part set forth in the description.

The objects of our invention are accomplished by traversing the thread guide lengthwise of the thread carrier, and by imposing upon this trav-' ersing motion a secondary motion induced by driving the mechanism at inconstant speed.

In the drawings, Figure 1 is an end view, with a portion .of the frame removed, of a typical double-deck throwing machine with spindles and motor omitted; Figure 2 is a section on the line 11-11 of Figure 1 showing the essentials of our improved throwing machine; Figure 3 represents an unrolled and flattened bobbin surface showing the irregular paths of various thread layers and the sinuous manner of laying. Figure 4 is a view similar to Figure 2 enlarged showing the spring against which the gear 64 works; Figure 5 shows a modified arrangement of the spring.

In the figures of the drawings l-is an end frame of a typical double-deck throwing machine only the upper deckof which is detailed; 2 are bobbins being wound with rayon; 3 is a. traversing bar which carries the thread guides (invisible); 4 are surface driving rolls for rotating the bob- .bins; 5 is a. lever fulcrum attached to the end frame; 5! is a lever fulcrum on support 5 operatively attached at its upper end to traversing bar 3; 6 is a stud mounted in end frame I; BI is a long hub mounted for rotational movement and for slidingmovement outward against the action of a spring (not shown) within the hub on stud 6; 62 is a cam wheel on the hub 6|; 52 is a cam follower, on the lower end of lever 5|, which meshes with the groove 63 in cam wheel 62 and imparts reciprocating motion to the traversing bar 3 and its attached guides; 64 is a gear wheel mounted on hub BI; 65 is a pin attached to the face of gear wheel 64; 66 is a gear wheel mounted for rotational movement upon stud 6; 61 is a cam on the face of gear 66 with which pin 65 makes contact; 68 is a spring, exposed in Figure 4 for ease of illustrating the principles of the invention, against which the hub of gear 64 is pressed by pin 65 as it rides on cam 61; I is a stud mounted in frame I above stud 6; H is a pinion mounted for rotational motion upon stud I meshing with gears 66 and 64; I2 is an elliptical gear attached to pinion ll; 13 is an elliptical gear which is driven from'a source of power not shown and which meshes with and drives gear 12. The source of power may conveniently be the driven shaft which carries rolls 4.

The operation of the machine is as follows:

Asource of power turns gear 13 which drives gear 12 and pinion 1| which drives both gear wheel 64 and gear wheel 66. Gear wheels 64 and 66 are slightly difierent in size in order to give gear wheel 66 rotational movement with respect to gear wheel 64. As gear wheel 66 rotates with respect to gear wheel 64 cam 61, through its contact with pin 65, forces gear wheel 64, hub GI, and cam wheel 62 outwardly against the action of the spring 68 whichis preferably located within hub 6| butwhich is shown as exterior to the hub in Figure 4 for purposes of convenience. As gear wheel 64 revolves cam 62 imparts a reciprocating motion to the lever 5|, the traversing bar 3, and the guides mounted thereon; It follows, consequently, that the cam wheel 63 imparts a primary reciprocating motion of constant length to the thread guides; that the slow, endwise sliding movement of the hub 62 imparts a secondary shifting motion to the point of origin of the reciprocating stroke of the guides; and that a tertiary. motion .is imposed upon the guides by 2 ellipticalgears have 38 teeth; the pinion has 34 teeth; the cam faced gear has 112 teeth; and

the cam wheel gear has 115 teeth. By this arrangement one revolution of the cam wheel necessitates about 3.3 revolutions of the elliptical gears and thereis one complete reciprocation of the hub in about 37 turns of the cam wheel. If the motion is traced out on a roller revolving at constant speed, a series of curves such a shown in Figure 3 will be obtained. Because the elliptical gears make an odd fractional number of revolutions per traverse stroke, the thread zig-zag's and gears. If this ratio becomes greater than, for instance, 3 to 1 the magnitude of the nodes and loops of the curves in Figure 3 will be greater. If the number of the teeth is decreased, a greater number of cycles will occur per traverse stroke.

The modifications possible by the application of these principles to the device are practically unlimited and will be used by the engineer to adapt the machine to the needs of the particular process.

Elliptical gears have been shown and described as satisfactory in imparting the inconstant motion to the traversing mechanism but are not essential as such because any gears, other than circular, will produce a similar result. It isnecessary only that variable, angular speed of. the cam be obtained to obtain thesinuous winding. Indeed, the gears might be substituted by a motor having constantly fluctuating speed with the production of a similar result. All such modifications are deemed within the scope of our invention.

In the modification disclosed in Figure 5 all elements are' the same as hereinbefore described except that spring 68' is attached to the frame of the machine and to the lever 5|, rather than to the stud 6, as in Figure 4. a

An advantage of our invention is in the winding of a loose, open, uniformly permeable package of thread. Another advantage of the invention is in theimproved throwing machine. Another advantage of the invention is in laying the thread in a sinuous path. An advantage of laying the thread in a sinuous path'is that the outer layers of thread can shrink a certain amount beforetheir shrinkage is retarded by the under layers. Other advantages of the invention will be apparent.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that we do not limit ourselves to the specific embodiments thereof except as defined in the appended claims.

We claim: 1. In a thread winding machine a thread collector, a thread guide, and means for traversing the guide comprising: cam means mounted for sliding and rotational movement 'operatively connected tosaid guide, and means for rotating the cam means including means for imparting irregular rotational and sliding motion thereto.

2. In a thread winding machine a thread-col- V lector, a thread guide, and means for traversing the guide comprising: cam means mounted for sliding and rotational movement operatively connected to said guide, means for rotating the cam means including means for imparting irregular rotational and sliding motion thereto, and means for axially reciprocating the cam means.

3. In a thread winding machine a rotatable thread collector, a traversing thread guide, and means for traversing the guide comprising: cam means mounted for sliding and rotational movement operatively connected to said guide, means for slowly, axially reciprocating the cam means, and means for imparting irregular rotational and sliding motion to the guide traversing means comprising: an elliptical gear in driving relation to said cam means, and a driven elliptical gear meshing with said elliptical'gear.

4. In a thread winding machine a rotatable thread collector, a traversing thread guide and means for traversing the guide comprising: cam means mounted for sliding and rotational movement, a lever operated by said means attached to the guide, a gear attached to the cam means having a surface in contact with a cam on a gear of 5. In a thread winding machine a rotatable thread collector, a traversing thread guide and means for traversing the guide comprising: a cam wheel mounted for. sliding and rotational movement, a lever operated by the cam wheel and attached to the guide, a gear attached to the cam wheel having a pin projecting from its face, a gear of different size having a cam face in contact with said pin, a pinion meshing with each said gear, an elliptical gear attached to said pinion, and a driven elliptical gear meshing with said elliptical-gear.

6. In a thread winding machine a rotatable thread collector, a traversing thread guide and means for traversing the guide comprising: a

stud, a cam wheel mountedfor sliding and rotational movement on the stud, a lever operated by the cam wheel and attached to the guide, a gear attached to the cam wheel having a pin projecting from its face, a gear of different size mounted for rotation on said stud and having a cam face in contact with said pin, a pinion mesh ing with each said gear, an elliptical gear operatively attached to said pinion, and a driven elliptical gear, meshing with said elliptical gear.

7. In a winding machine a thread guide, a means for shifting the point of origin thereof comprising two gears of different size driven by a. single pinion, a cam on the face of one said gear engaged by a projection on the face of the other said gear whereby one said gear is moved with respect to the other said gear, and means for driving the pinion withnon-uniform velocity comprising intermeshing elliptical gears.

8. In a winding machine a thread guide, a means for shifting the point of origin thereof comprising two gears of different size driven by a single pinion, a cam on the face of one said gear engaged by a projection on the face of the other said gear whereby one said gear is moved with respect to the other said gear, and means for driving the pinion with non-uniform velocity comprising .intermeshing non-circular gears.

ERNEST K. GLADDING. DAVID FRANKIm EVANS. 

